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Morphological and biochemical systematics of Australian freshwater and estuarine fishes of the family Percichthyidae

MacDonald, C.M.

Description

The taxonomy and evolutionary relationships of six Australian species of the family Percichthyidae have been investigated using data obtained from comparative morphological examination of preserved specimens and from electrophoretic detection of variation in proteins extracted from liver and muscle tissue. Members of the genera Maaaulloahella, Pleatroplites Maaquaria and Peraalates form a group of generalised percoid species that have presumably colonised Australian freshwaters from...[Show more]

dc.contributor.authorMacDonald, C.M.
dc.date.accessioned2013-12-09T06:01:05Z
dc.identifier.otherb11649240
dc.identifier.urihttp://hdl.handle.net/1885/10988
dc.description.abstractThe taxonomy and evolutionary relationships of six Australian species of the family Percichthyidae have been investigated using data obtained from comparative morphological examination of preserved specimens and from electrophoretic detection of variation in proteins extracted from liver and muscle tissue. Members of the genera Maaaulloahella, Pleatroplites Maaquaria and Peraalates form a group of generalised percoid species that have presumably colonised Australian freshwaters from marine origins. On morphological grounds the group is here considered to belong in the basal percoid family Percichthyidae rather than in the specialised family Serranidae to which it has been previously assigned. Some doubt remains, however, as to the affinities of the genus Maaaulloahella. Evidence from morphological studies, and from electrophoretic analysis of protein variation at 19 genetic loci, indicates that Maaaulloahella differs extensively from the other genera and that the two subgroups so formed represent separate invasions of freshwaters by already distinct marine ancestors. The Australian genera Pleatroplites, Maaquaria and Peraalates form a closely related monophyletic group which could be assigned to a single genus. The oldest available name for such a genus is Maaquaria Cuvier and Valencieenes, 1830. Morphological and electrophoretic evidence supports the distinction of two species of Maaaulloahella, but no significant variation was detected between Peraalates specimens initially identified as either P. ~ conolorum or P. novemaculeatus. Geographically separated conspecific populations of Plectroplites ambiguus exhibit a clinal increase in degree of morphological variation which corresponds to increasing geographical distance between the populations compared. Within this clinal pattern there is a clear distinction between the populations of the Murray-Darling drainage area and the internal drainage area populations of the Bulloo and Wilson river. Up to 50 per cent of the 32 morphometric and meristic characters examined showed significant variation between populations from these two areas. Electrophoretic data does not reflect a corresponding degree of genetic divergence between Plectroplites ambiguus populations, but the polymorphic glucose phosphate isomerase-1 ~ locus revelas a clinal variation pattern similar to that obtained from the morphological studies. It is considered, however, that the morphological and electrophoretic variation observed in Plectroplites ambiguus populations is not sufficient to indicate the existence of distinct subspecies or species. Macquaria australasica populations exhibit similar amounts of morphological divergence to Plectroplites ambiguus populations. This variation was not found to have an ordered pattern of geographical distribution, although there is so1ne indication of a distinction between Macquaria australasica populations from either side of the Great Dividing Range.
dc.language.isoen_AU
dc.titleMorphological and biochemical systematics of Australian freshwater and estuarine fishes of the family Percichthyidae
dc.typeThesis (Masters)
local.contributor.supervisorWeatherley, A.H.
local.contributor.supervisorBarwick, R.E.
dcterms.valid1976
local.description.notesThis thesis has been made available through exception 200AB to the Copyright Act.
local.description.refereedYes
local.type.degreeMaster by research (Masters)
dc.date.issued1976
local.contributor.affiliationThe Australian National University
local.request.nameDigital Theses
local.identifier.doi10.25911/5d7633906262e
local.mintdoimint
CollectionsOpen Access Theses

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